What do you get when you mix six piglets, four monkeys and the deadly Ebola virus? Bad news, according to a recent experiment by Canadian researchers.

The experiment is the first to suggest that the Ebola virus can spread through the air. The study, published in November, detailed how the virus apparently moved from pigs to monkeys without their coming into physical contact. Previously, researchers thought animals had to touch to pass along the virus, which has been blamed for the deaths o...